A wired broadcasting system comprises a plurality of subscriber stations each connected to a central exchange by a respective transmission cable, a plurality of bus-bars located at the central exchange, a plurality of program sources for applying television signals at a first frequency to respective bus-bars, a plurality of switches located at the central exchange for selectively connecting each subscriber cable to any one of the bus-bars, and at least one receiver at each subscriber station for...

A packet broadcasting method broadcasts a data packet sent by a broadcasting source terminal to a number of broadcast destination terminals. A broadcasting apparatus having a peculiar DTE address is provided in a packet switching system and a broadcasting table having one or a plurality of broadcasting source terminals is defined in the broadcasting apparatus. The broadcasting apparatus registers a terminal other than a broadcasting source terminal into the broadcasting table as a broadcast dest...

A satellite broadcasting tuner with which satellite broadcasting of any channel can be enjoyed only by a channel selecting operation thereof whether or not broadcasting of the channel involves special signal processing. The tuner includes external input terminals for receiving video and aural signals from an external decoding apparatus, a changing over circuit for alternatively coupling video and aural signals from the external input terminals or video and aural signals from a signal processing ...

A digital audio broadcasting system that is capable of providing a large number of high quality stereophonic channels to mobile receivers in an environment with severe multipath delay and fading. Optimum combination of frequency and time diversity to guarantee robust performance in the mobile channel, with its multipath delay and frequency-selective fading effects. The system is based upon a dynamic single channel per carrier assignment of each stereo channel to many carriers. Intersymbol interf...

An RF communication system contains a control module which communicates with a plurality of user modules that are each connected to at least one user device. The system provides a method for packet communications in which traditional destination addressed packets are communicated to the specified destination point or user module while also permitting information intended for a plurality of user modules to be broadcast simultaneously to all user modules using a broadcast protocol. The probability...

A facsimile broadcasting receiver comprising an index program detector and a recording means, the detector detecting an index program number from a facsimile signal. The detected index program number is recorded into the recording means so that the corresponding index program will be automatically recorded.

Broadcasting system digitizes audio input signals before RF modulating and transmitting over airwaves to one or more remote receiving stations. Receiving station recovers the digitized signal by demodulating and exponentially expanding the received RF signal. Recovered digital signal is subsequently frequency modulated and sent, via an electrically conductive cable, to an FM radio, over which the original audio input signals are faithfully reproduced. A time switch in series with the RF receiver...

In a television receiver in which image frequency signals for desired signals are removed when television broadcasting signals are frequency-converted through a local oscillator and mixers, the local oscillator generates biaxial orthogonal signals to be frequency-converted by respective mixers, an output signal of one mixer being phase-shifted to be added to an output signal of the other mixer so as to thereby offset only the image frequency signals. The local oscillator and a phase shifter oper...

A data broadcasting system for the low-cost delivery of character-heavy data such as newspapers and magazines. Newspaper or other data are transmitted from a newspaper publisher or service to an artificial satellite via a broadcasting center to be relayed to a subscriber. The subscriber receives the data by means of a receiver via an outdoor apparatus. The received data are sent to a recorder to be recorded on a recording medium such as a compact magneto-optical disc for later display.

A system for the so-called "pay-per-program" is provided for viewing individual program on pay basis without signing a comprehensive contract. In response to a request for viewing a pay program executed via public telephone line from an applicant for viewing, a charging center sends a viewing permit code for viewing a pay program to a data communication device and collects a fee for the pay program. Upon receipt of the viewing permit code, a receiving device offers the pay program according to t...